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Flag NameSourceTypeValuesComment SequenceExpstringENABLE PAUSE ABORT Delay1Expinteger Time on IDLE Time_StampLHCstringUTC time StepLHCinteger Scan step as indicated in the sequence file. For states IDLE and SUSPENDED a step value of 9999 will be broadcast. For the first STANDBY the broadcast step value will be 0, for the last STANDBY (corresponding to END_SEQUENCE) the broadcast step will be the one indicated in the sequence file. Acquisition_FlagLHCbooleanFalse=DISABLEDTrue =ENABLED False = beam(s) may be moving True = beams are quiescent LumiScan_StatusLHCstringSTANDBY TRIMMING IDLE ACQUIRING SUSPENDED Indicates the state machine states as in Fig. 2. Step_ProgressLHCinteger Countdown of T1 or of the time specified in the SECONDS_WAIT command; depends on the state. 9/15/2014 R. Alemany BE/OP/LHC LHC Background Study Group: LBS #57 13

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Flag NameSourceTypeValuesComment Set_Nominal_Displacem ent_B1_sepPlane LHCdoubleIntegrated B1 displacement in the separation plane w.r.t. first position broadcast after the command INITIALIZE_TRIM (mm). Here the SET value as specified in (or inferred from) the sequence file is given. Set_Nominal_Displacem ent_B2_sepPlane LHCdoubleIntegrated B2 displacement in the separation plane w.r.t. first position broadcast after the command INITIALIZE_TRIM (mm). Here the SET value as specified in (or inferred from) the sequence file is given. Set_Nominal_Displacem ent_B1_xingPlane LHCdoubleIntegrated B1 displacement in the crossing plane w.r.t. first position broadcast after the command INITIALIZE_TRIM (mm). Here the SET value as specified in (or inferred from) the sequence file is given. Set_Nominal_Displacem ent_B2_xingPlane LHCdoubleIntegrated B2 displacement in the crossing plane w.r.t. first position broadcast after the command INITIALIZE_TRIM (mm). Here the SET value as specified in (or inferred from) the sequence file is given. Read_Nominal_Displace ment_B1_sepPlane LHCdoubleB1 displacement in the separation plane. Here the value READ from the TRIM controller will be given. Table 2 shows an example of the values read from a vertical luminosity optimization and Table 3 shows an example of the values read during a vertical vdM scan. Read _Nominal_Displacement _B2_sepPlane LHCdoubleB2 displacement in the separation plane. Here the value READ from the TRIM controller will be given. Table 2 shows an example of the values read from a vertical luminosity optimization and Table 3 shows an example of the values read during a vertical vdM scan. Read _Nominal_Displacement _B1_xingPlane LHCdoubleB1 displacement in the crossing plane. Here the value READ from the TRIM controller will be given. Table 2 shows an example of the values read from a vertical luminosity optimization and Table 3 shows an example of the values read during a vertical vdM scan. Read _Nominal_Displacement _B2_xingPlane LHCdoubleB2 displacement in the crossing plane. Here the value READ from the TRIM controller will be given. Table 2 shows an example of the values read from a vertical luminosity optimization and Table 3 shows an example of the values read during a vertical vdM scan. Nominal_SeparationLHCdoubleIntegrated total separation (in the x-y plane) between B1 and B2, as inferred from the four Set_Nominal_Displacements above. Needed for backward compatibility with the existing vdM scan software. 9/15/201414

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Flag NameSourceTypeValuesComment PlaneLHCstringSEPARATION CROSSING MIXED NONE Used by the experiment to identify the scan plane of the whole sequence and not the plane in which the beam moved at each step. Identified by the algorithm during the syntax validation phase. It is fixed at the beginning. NONE is sent when there is no scan ongoing. IPLHCinteger2 1 +2 2 +2 5 +2 8 all IP being scanned. 2 1 +2 5 only IP1 and 5 being scanned Used by the experiment to identify the IP(s) being scanned all along the whole sequence and not the IP(s) moved at each step. 0 when no scan is ongoing. BeamLHCinteger1,2,3,03 = both beams scan; 0 = no beam scan. 2 NEW VARIABLES TO IMPLEMENT ON THE EXPERIMENT SIDE e.g. DIP/ALICE/LHC/…/LUMINOSITYAUTOSCAN 17 NEW VARIABLE TO IMPLEMENT ON THE LHC SIDE e.g. DIP/ACC/LHC/BEAM/LUMINOSITYAUTOSCAN 9/15/2014 R. Alemany BE/OP/LHC LHC Background Study Group: LBS #57 15

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1. Background from experiments, IS IT WORTH HAVING A DEDICATED TALK ABOUT THIS DURING A NEXT MEETING? The aim being that LHC OP will like to understand those numbers 2. Pile-up measurement, IS IT WORTH GETTING THIS INFORMATION IN THE LHC CCC or INSTANTANEOUS LUMI IS ENOUGH? 9/15/2014 R. Alemany BE/OP/LHC LHC Background Study Group: LBS #57 17

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This is a presentation intended to open the discussion. Please feel free to send us new variables to include when ever you are ready. 9/15/2014 R. Alemany BE/OP/LHC LHC Background Study Group: LBS #57 18